buf.slice([start[, end]])
Returns a new Buffer that references the same memory as the original, but offset and cropped by the start and end indices.
Note that modifying the new Buffer slice will modify the memory in the original Buffer because the allocated memory of the two objects overlap.
Example: build a Buffer with the ASCII alphabet, take a slice, then modify one byte from the original Buffer.
const buf1 = Buffer.allocUnsafe(26);
for (var i = 0 ; i < 26 ; i++) {
buf1[i] = i + 97; // 97 is ASCII a
}
const buf2 = buf1.slice(0, 3);
buf2.toString('ascii', 0, buf2.length);
// Returns: 'abc'
buf1[0] = 33;
buf2.toString('ascii', 0, buf2.length);
// Returns : '!bc'Specifying negative indexes causes the slice to be generated relative to the end of the Buffer rather than the beginning.
const buf = Buffer.from('buffer');
buf.slice(-6, -1).toString();
// Returns 'buffe', equivalent to buf.slice(0, 5)
buf.slice(-6, -2).toString();
// Returns 'buff', equivalent to buf.slice(0, 4)
buf.slice(-5, -2).toString();
// Returns 'uff', equivalent to buf.slice(1, 4)
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